The Pine Ridge Indian Reservation in southwest South Dakota is home to Badlands National Park. But not far from the otherworldly beauty of the park is the harsh reality of life on the reservation. The estimated 29,000 to 40,000 residents of the reservation hold on to a rich cultural history but live amidst poverty that rivals the third world. Watch the full story Friday on 20/20 at 10 p.m. ET. (Getty Images)